206039891 has 4 divisors (see below), whose sum is σ = 206085552. Its totient is φ = 205994232.

The previous prime is 206039879. The next prime is 206039893. The reversal of 206039891 is 198930602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206039891 - 2¹⁰ = 206038867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206039893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15215 + ... + 25368.

It is an arithmetic number, because the mean of its divisors is an integer number (51521388).

Almost surely, 2^206039891 is an apocalyptic number.

206039891 is a deficient number, since it is larger than the sum of its proper divisors (45661).

206039891 is an equidigital number, since it uses as much as digits as its factorization.

206039891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45660.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 206039891 is about 14354.0896959717. The cubic root of 206039891 is about 590.6321778884.

The spelling of 206039891 in words is "two hundred six million, thirty-nine thousand, eight hundred ninety-one".